关键词: 短波地空通信, 信道排序, 自动链路建立（ALE）, 加权算法, 实效性分布

Abstract: To the characteristics of route’s channel quality ordering under two models LQA and prediction，the reliability distributing of LQA which can be regarded as revised factor of LQA channel quality ordering is achieved according to the analysis of route’s SNRs.Combined with the propagation predictions model，the channel quality ordering scheme under the weighted algorithm is given；according to the ALE working mode，capability evaluating standards are established， and the theoretical models of successful rate of link establishment and average link establishment time are constructed；and the simulation results show that the channel ordering ascertained by weighted algorithm has a high resemblance with the real ordering.Its successful rate of one time link establishment precedes the LQA model’s and prediction model’s，and the average link establishment time at each point on the route is shorted，which provides theoretical basis for channel ordering when the route ALE calling link is being established.

Key words: HF air-to-ground communications, channel ordering, Automatic Link Establishment（ALE）, weighted algorithm, reliability distribution